The System Dynamical Reliability Analysis of the Structure¡¡with
Multi-degree-of-freedom to Non-stationary Random Excitation
Shi Shaoqing 
(Chongqing logistical Engineering College, 400041)
Jiang Jiesheng
(Northwestem Polytechnical University, 710072)

Abstract: According to the Priestley's evolutionary spectrum theory, the evolutionary spectra and the time  variant cross correlation function of the response are analyzed firstly for multi-degree-of-freedom (MDOF) systems subjected to non-stationary random excitation. Secondly, the sysem dynamical reliability analysis of MDOF systems to non-stationary random excitation is presented by the dynamical criterion of first-passage. Finally, a new method to determine the upper and lower bounds of the system dynamical reliability for MDOF is proposed.
Keywords: evolutionary spectrum, dynamical crierion of first passage, the system dynamical reliability.